So my mouse has had a little bald patch on her snout for a while, and I just assumed she was over grooming, but recently it's gotten a lot bigger. She isn't acting any differently and I can't take her to the vets, does anyone know what this could be? Does she need a better diet or more exercise? Could she be ill? She is going on a year old so it might just be aging but her sister isn't showing any signs...